| 摘要 |
PURPOSE:To prevent the development of blow hole by reducing cross sectional area in a runner step by step in a mold for forming a cylinder block for multi- cylinder internal combustion engine and constituting the mold so as to uniformize rising of molten metal surface flowing into cavity through a gate from a runner. CONSTITUTION:In the molten metal pouring control into the mold for forming the cylinder block in the multi-cylinder, the mold M with bottom face 17b of the runner formed to rising step state and top face 17c formed to horizontal and reducing the cross sectional area in the runner step by step, is used. By this setting of the cross section, the mold is constituted so that the raising surface of molten metal in the cavity C comes to uniformize the whole surface through each gate 19 from the runner 17. By this method, involution of gas into the molten metal can be prevented and therefore, the development of blow hole in the cylinder block is prevented and the quality can be improved. |
